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this post was submitted on 16 Mar 2025
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I saw the video pop up in my Youtube recommended, but didn't bother watching because I just assumed that any cars tested would be using LIDAR and thus would ignore the fake road just fine. I had no idea Tesla a) was still using basic cameras for this and b) actually had sophisticated enough "self driving" capabilities that this could be tested on them safely.
They are not still using cameras but removed LIDAR and radar from their cars during the chip shortage 2020/21. The story they were telling was "humans don't have LIDAR but can drive cars as well, so the cars also only need 'eyes' like humans".
Humans cannot, in fact, drive cars well. Humans kill tens of thousands of other humans with cars every year in the US alone.
Yup, cameras and humans share various exploits. Self-driving is going to work better than humans once every car has it and communicates with each other, allowing for minimal gaps even at high speeds, once roads are all very standardized and in a database, and-
Wait, that's trains
Fucking build more electrified high-speed rail and forget tech bros' shitty promises
I was getting mildly outraged and ready to comment how you were re-deriving the train at first. Well played.
They really had me in the first half, not gonna lie
And the really dumb thing is that lots of modern non-selfdriving cars now have lidar sensors to help the humans not crash into things. Musk apparently wants the AI to be working at a disadvantage.
He just wants people to buy his junk, and doesn't care how many people would have to die as collateral damage.
That should tell you just how vastly complicated driving is.
There are plenty of uncomplicated things that humans do poorly, too.
Walking up and down stairs, not that I'd know.
And let me just add, Musk ordered the LIDAR removed against the engineers better judgement.
Did he have lidar removed? I thought it was radar. I didn't think any Tesla vehicle ever took on the cost of lidar.
This is true. There never was LIDAR.
Small correction here: they never had LIDAR. Cars with LIDAR have big racks on top with a spinny thing measuring the surroundings. Teslas had radar but removed during the chip shortage (and disabled it on existing cars) and acted like it was an improvement. The radar was used for distance keeping on cars and could actually detect the car in front of the car by bouncing signals off the ground, it was really slick.
Spinny thing is just when you mount one ontop. It doesn't have to be. The example in the video appears to use a forward facing cone LIDAR. Presumably in addition to other sensors.
It's still a spinny thing with a laser in it. That's fundamentally how lidar works. The outside shell can look however they want it to look.
I'll add that every other self driving car company has a pretty good safety record, specifically because they do use LIDAR and RADAR so they can see better than humans.
That statement of him is not entirely wrong. But we humans have a very powerful bio computer that is perfectly tuned to process those visual inputs in realtime. Until a comparable performance is possible, removing LIDAR is very stupid.
Besides that, in the fog and rain tests a human likely would have killed a kid anyway, and why settle for human limitations when you could be safer?
We absolutely should also have lidar or analogous tech as part of a solution here, even if cameras did manage to get to human level safety.
The child dummy was clearly visible through the water in the rain test. Tesla's systems just suck.
Also competent drivers generally know to slow down during rain. Hell I was literally taught to drive some roads like its a speedway and even I drop below the speed limit during the rain if visuals are bad enough, especially first rain pulls oils out of the road makes it slippery and may cause hydroplaning.
IIRC Musk said it would rely on AI using the footage from all the Teslas and it’s better than LiDAR. That idiot was proven wrong once again.
They tested a LiDAR rigged car, and it stopped just like you predicted. As of 2021, Tesla uses only cameras for FSD, and not even radar (which my stupid fine Toyota truck has).
They tested the idea safely by building the wall out of styrofoam, or at least that's what it looks like when it blows apart :)
Front-facing radar is the bare minimum needed to pass the test given (fake-road wall). Many vehicles use it for adaptive cruise control, and radar is even faster than either cameras or lidar for figuring out the range to an object. 1000 Hz measuring distance to an object is enough to find both the relative velocity and the acceleration of another object. This provides enough time to apply the brakes safely when approaching a vehicle or obstacle
LIDAR is even better, and also more compute intensive and expensive to install.
I think Tesla was very short-sighted in removing radar sensors, certainly. If they hadn’t, they could’ve spent more of their energy on making the FSD cars better instead of just making them sufficiently safe with insufficient sensors